Printing-form.



W. J. P. MAIDHOP.

PRINTING FORM.

APPLICATION FILED JUNE 16, 1911.

1,053,518, Patented Feb. 18, 1913.

WILLIAM J. F. MAIDHOF, OF NEW YORK, N. Y.

PRINTING-FORM.

Specification of Letters Patent.

Patented Feb. 18, 1913.

Application filed June 16, 1911. Serial No. 633,508.

To all whom it may concern Be it known that I, \VILIJAM J. F. Man)- .nor, a citizen of the United States, and resident of the borough of Bronx, in the city and State of New York, have invented a new and useful Improvement in Printing- Forms, of which the following is a specification.

This invention relates to printing forms or plates, with the object in view of providing aform in which the dies have a support for their bases whereby a clearer and more precise printing effect may be obtained, novel means being provided for firmly securing the dies to the back plate.

Other objects are to provide a novel device for permitting the removal of th dies together with the spacing bars; to obviate the necessity of employing an ordinary chase or frame; and to provide certain improvements in the form, construction and arrangement of the several parts whereby the above mentioned objects may be more effectively carried out.

In the accompanying drawings, Figure 1 represents a face View of the printing plate, Fig. 2 is an end View of the same, Fig. 3 is a sectional View taken in the plane of the line AA of Fig. 1, and Fig. 4 is a sectional View taken in the plane of the line 13-13 of Fig. 1.

The back plate is denoted by 1 and the spacing bars by 2. The back plate is provided with undercut side members 3 extending along the extreme lateral edges of the back plate at right angles to the spacing bars 2. These undercut side members are secured to the back plate 1 by suitable fastening means such as screws 4. These undercut side members 3 are provided with longitudinal slots 5 arranged at right angles to the plane of the back plate which slots are fitted to receive screws 6 for clamping the spacing bars 2 at any desired position along the side members 3. The spacing bars 2 are so shaped at their ends as to match the undercut side members 3 so as to bring the outer faces of the spacing bars flush with the outer faces of the side mem bers. These spacing bars are furthermore provided with interiorly screw threaded sockets 7 in their ends for receiving the screw 6.

The dies are denoted by 8 and are provided with reccses 9 which are fitted to receive the lateral projections 10 of the spacing bars 2 for securing the dies in position on the back plate.

In operation, the screws 6 which clamp the spacing bars to the undercut side members and thereby to the back plate may be loosened and the spacing bars separated sufficiently from each other to permit the insertion of the dies 8. lVhen the dies have been placed in the desired position, the spacing bars may be manually forced toward each other until they have firmly engaged the dies, when the spacing bars may be secured in the position thus obtained by tightening the screws 6. The dies will now be firmly secured to the back plate and the printing form will be ready for the printing operation.

It will be seen that the spacing bars 9 may be removed thus permitting the use of any number of spacing bars on a given back plate for securing various sizes of dies to the back plate. It. will also be seen that by causing the dies to rest upon the back plate a firm backing is established for insuring a clearer and more precise printing effect.

hat I claim is 1. A printing form comprising dies, a back plate therefor having longitudinal side members provided with elongated slots arranged in planes at right angles to the plane of the back plate, laterally adjustable spacing bars having their ends in the lateral plane of the said slots and means directly engaging the ends of the bars and the said slots for securing the bars at any point along the slots.

2. A printing form comprising dies, a back plate therefor having undercut longitudinal side members provided with elongated slots arranged in planes at right angles to the plane of the back plate, laterally adjustable spacing bars having their ends in the lateral plane of said slots and means directly engaging the ends of the bars and the said slots for securing the bars at any point along the slots.

3. A printing form comprising dies, a back plate therefor having undercut longitudinal side members provided with elongated slots arranged in planes at right angles to the plane of the back plate, laterally adjustable spacing bars having their ends in the lateral plane of the said slots and screws having shanks fitted for s1idin presence of two Witnesses this thirtyable engagement With said slots and threadfirst day of May, 1911.

ed into the ends of said bars for securing WILLIAM J. F. MAIDHOF.

the bars at any point along the slot. Witnesses: 5 In testimony, that I claim the fore oing F. GEORGE BARRY,

as my invention, I have. signed my name HENRY C.T1-I 1EME.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

